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        <h3>event-custom&nbsp; <span class="subtitle">3.3.0</span></h3>
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                        <div class="highlight"><pre><span class="cm">/**</span>
<span class="cm"> * Custom event engine, DOM event listener abstraction layer, synthetic DOM</span>
<span class="cm"> * events.</span>
<span class="cm"> * @module event-custom</span>
<span class="cm"> * @submodule event-custom-base</span>
<span class="cm"> */</span>

<span class="cm">/**</span>
<span class="cm"> * Allows for the insertion of methods that are executed before or after</span>
<span class="cm"> * a specified method</span>
<span class="cm"> * @class Do</span>
<span class="cm"> * @static</span>
<span class="cm"> */</span>

<span class="kd">var</span> <span class="nx">DO_BEFORE</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span>
    <span class="nx">DO_AFTER</span> <span class="o">=</span> <span class="mi">1</span><span class="p">,</span>

<span class="nx">DO</span> <span class="o">=</span> <span class="p">{</span>

    <span class="cm">/**</span>
<span class="cm">     * Cache of objects touched by the utility</span>
<span class="cm">     * @property objs</span>
<span class="cm">     * @static</span>
<span class="cm">     */</span>
    <span class="nx">objs</span><span class="o">:</span> <span class="p">{},</span>

    <span class="cm">/**</span>
<span class="cm">     * Execute the supplied method before the specified function</span>
<span class="cm">     * @method before</span>
<span class="cm">     * @param fn {Function} the function to execute</span>
<span class="cm">     * @param obj the object hosting the method to displace</span>
<span class="cm">     * @param sFn {string} the name of the method to displace</span>
<span class="cm">     * @param c The execution context for fn</span>
<span class="cm">     * @param arg* {mixed} 0..n additional arguments to supply to the subscriber</span>
<span class="cm">     * when the event fires.</span>
<span class="cm">     * @return {string} handle for the subscription</span>
<span class="cm">     * @static</span>
<span class="cm">     */</span>
    <span class="nx">before</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">fn</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">sFn</span><span class="p">,</span> <span class="nx">c</span><span class="p">)</span> <span class="p">{</span>
        <span class="c1">// Y.log(&#39;Do before: &#39; + sFn, &#39;info&#39;, &#39;event&#39;);</span>
        <span class="kd">var</span> <span class="nx">f</span> <span class="o">=</span> <span class="nx">fn</span><span class="p">,</span> <span class="nx">a</span><span class="p">;</span>
        <span class="k">if</span> <span class="p">(</span><span class="nx">c</span><span class="p">)</span> <span class="p">{</span>
            <span class="nx">a</span> <span class="o">=</span> <span class="p">[</span><span class="nx">fn</span><span class="p">,</span> <span class="nx">c</span><span class="p">].</span><span class="nx">concat</span><span class="p">(</span><span class="nx">Y</span><span class="p">.</span><span class="nb">Array</span><span class="p">(</span><span class="nx">arguments</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="kc">true</span><span class="p">));</span>
            <span class="nx">f</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">rbind</span><span class="p">.</span><span class="nx">apply</span><span class="p">(</span><span class="nx">Y</span><span class="p">,</span> <span class="nx">a</span><span class="p">);</span>
        <span class="p">}</span>

        <span class="k">return</span> <span class="k">this</span><span class="p">.</span><span class="nx">_inject</span><span class="p">(</span><span class="nx">DO_BEFORE</span><span class="p">,</span> <span class="nx">f</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">sFn</span><span class="p">);</span>
    <span class="p">},</span>

    <span class="cm">/**</span>
<span class="cm">     * Execute the supplied method after the specified function</span>
<span class="cm">     * @method after</span>
<span class="cm">     * @param fn {Function} the function to execute</span>
<span class="cm">     * @param obj the object hosting the method to displace</span>
<span class="cm">     * @param sFn {string} the name of the method to displace</span>
<span class="cm">     * @param c The execution context for fn</span>
<span class="cm">     * @param arg* {mixed} 0..n additional arguments to supply to the subscriber</span>
<span class="cm">     * @return {string} handle for the subscription</span>
<span class="cm">     * @static</span>
<span class="cm">     */</span>
    <span class="nx">after</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">fn</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">sFn</span><span class="p">,</span> <span class="nx">c</span><span class="p">)</span> <span class="p">{</span>
        <span class="kd">var</span> <span class="nx">f</span> <span class="o">=</span> <span class="nx">fn</span><span class="p">,</span> <span class="nx">a</span><span class="p">;</span>
        <span class="k">if</span> <span class="p">(</span><span class="nx">c</span><span class="p">)</span> <span class="p">{</span>
            <span class="nx">a</span> <span class="o">=</span> <span class="p">[</span><span class="nx">fn</span><span class="p">,</span> <span class="nx">c</span><span class="p">].</span><span class="nx">concat</span><span class="p">(</span><span class="nx">Y</span><span class="p">.</span><span class="nb">Array</span><span class="p">(</span><span class="nx">arguments</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="kc">true</span><span class="p">));</span>
            <span class="nx">f</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">rbind</span><span class="p">.</span><span class="nx">apply</span><span class="p">(</span><span class="nx">Y</span><span class="p">,</span> <span class="nx">a</span><span class="p">);</span>
        <span class="p">}</span>

        <span class="k">return</span> <span class="k">this</span><span class="p">.</span><span class="nx">_inject</span><span class="p">(</span><span class="nx">DO_AFTER</span><span class="p">,</span> <span class="nx">f</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">sFn</span><span class="p">);</span>
    <span class="p">},</span>

    <span class="cm">/**</span>
<span class="cm">     * Execute the supplied method after the specified function</span>
<span class="cm">     * @method _inject</span>
<span class="cm">     * @param when {string} before or after</span>
<span class="cm">     * @param fn {Function} the function to execute</span>
<span class="cm">     * @param obj the object hosting the method to displace</span>
<span class="cm">     * @param sFn {string} the name of the method to displace</span>
<span class="cm">     * @param c The execution context for fn</span>
<span class="cm">     * @return {string} handle for the subscription</span>
<span class="cm">     * @private</span>
<span class="cm">     * @static</span>
<span class="cm">     */</span>
    <span class="nx">_inject</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">when</span><span class="p">,</span> <span class="nx">fn</span><span class="p">,</span> <span class="nx">obj</span><span class="p">,</span> <span class="nx">sFn</span><span class="p">)</span> <span class="p">{</span>

        <span class="c1">// object id</span>
        <span class="kd">var</span> <span class="nx">id</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">stamp</span><span class="p">(</span><span class="nx">obj</span><span class="p">),</span> <span class="nx">o</span><span class="p">,</span> <span class="nx">sid</span><span class="p">;</span>

        <span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="k">this</span><span class="p">.</span><span class="nx">objs</span><span class="p">[</span><span class="nx">id</span><span class="p">])</span> <span class="p">{</span>
            <span class="c1">// create a map entry for the obj if it doesn&#39;t exist</span>
            <span class="k">this</span><span class="p">.</span><span class="nx">objs</span><span class="p">[</span><span class="nx">id</span><span class="p">]</span> <span class="o">=</span> <span class="p">{};</span>
        <span class="p">}</span>

        <span class="nx">o</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">objs</span><span class="p">[</span><span class="nx">id</span><span class="p">];</span>

        <span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="nx">o</span><span class="p">[</span><span class="nx">sFn</span><span class="p">])</span> <span class="p">{</span>
            <span class="c1">// create a map entry for the method if it doesn&#39;t exist</span>
            <span class="nx">o</span><span class="p">[</span><span class="nx">sFn</span><span class="p">]</span> <span class="o">=</span> <span class="k">new</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">Do</span><span class="p">.</span><span class="nx">Method</span><span class="p">(</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">sFn</span><span class="p">);</span>

            <span class="c1">// re-route the method to our wrapper</span>
            <span class="nx">obj</span><span class="p">[</span><span class="nx">sFn</span><span class="p">]</span> <span class="o">=</span>
                <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
                    <span class="k">return</span> <span class="nx">o</span><span class="p">[</span><span class="nx">sFn</span><span class="p">].</span><span class="nx">exec</span><span class="p">.</span><span class="nx">apply</span><span class="p">(</span><span class="nx">o</span><span class="p">[</span><span class="nx">sFn</span><span class="p">],</span> <span class="nx">arguments</span><span class="p">);</span>
                <span class="p">};</span>
        <span class="p">}</span>

        <span class="c1">// subscriber id</span>
        <span class="nx">sid</span> <span class="o">=</span> <span class="nx">id</span> <span class="o">+</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">stamp</span><span class="p">(</span><span class="nx">fn</span><span class="p">)</span> <span class="o">+</span> <span class="nx">sFn</span><span class="p">;</span>

        <span class="c1">// register the callback</span>
        <span class="nx">o</span><span class="p">[</span><span class="nx">sFn</span><span class="p">].</span><span class="nx">register</span><span class="p">(</span><span class="nx">sid</span><span class="p">,</span> <span class="nx">fn</span><span class="p">,</span> <span class="nx">when</span><span class="p">);</span>

        <span class="k">return</span> <span class="k">new</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">EventHandle</span><span class="p">(</span><span class="nx">o</span><span class="p">[</span><span class="nx">sFn</span><span class="p">],</span> <span class="nx">sid</span><span class="p">);</span>

    <span class="p">},</span>

    <span class="cm">/**</span>
<span class="cm">     * Detach a before or after subscription</span>
<span class="cm">     * @method detach</span>
<span class="cm">     * @param handle {string} the subscription handle</span>
<span class="cm">     */</span>
    <span class="nx">detach</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">handle</span><span class="p">)</span> <span class="p">{</span>

        <span class="k">if</span> <span class="p">(</span><span class="nx">handle</span><span class="p">.</span><span class="nx">detach</span><span class="p">)</span> <span class="p">{</span>
            <span class="nx">handle</span><span class="p">.</span><span class="nx">detach</span><span class="p">();</span>
        <span class="p">}</span>

    <span class="p">},</span>

    <span class="nx">_unload</span><span class="o">:</span> <span class="kd">function</span><span class="p">(</span><span class="nx">e</span><span class="p">,</span> <span class="nx">me</span><span class="p">)</span> <span class="p">{</span>

    <span class="p">}</span>
<span class="p">};</span>

<span class="nx">Y</span><span class="p">.</span><span class="nx">Do</span> <span class="o">=</span> <span class="nx">DO</span><span class="p">;</span>

<span class="c1">//////////////////////////////////////////////////////////////////////////</span>

<span class="cm">/**</span>
<span class="cm"> * Contains the return value from the wrapped method, accessible</span>
<span class="cm"> * by &#39;after&#39; event listeners.</span>
<span class="cm"> *</span>
<span class="cm"> * @property Do.originalRetVal</span>
<span class="cm"> * @static</span>
<span class="cm"> * @since 2.3.0</span>
<span class="cm"> */</span>

<span class="cm">/**</span>
<span class="cm"> * Contains the current state of the return value, consumable by</span>
<span class="cm"> * &#39;after&#39; event listeners, and updated if an after subscriber</span>
<span class="cm"> * changes the return value generated by the wrapped function.</span>
<span class="cm"> *</span>
<span class="cm"> * @property Do.currentRetVal</span>
<span class="cm"> * @static</span>
<span class="cm"> * @since 2.3.0</span>
<span class="cm"> */</span>

<span class="c1">//////////////////////////////////////////////////////////////////////////</span>

<span class="cm">/**</span>
<span class="cm"> * Wrapper for a displaced method with aop enabled</span>
<span class="cm"> * @class Do.Method</span>
<span class="cm"> * @constructor</span>
<span class="cm"> * @param obj The object to operate on</span>
<span class="cm"> * @param sFn The name of the method to displace</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nx">Method</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">sFn</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">obj</span> <span class="o">=</span> <span class="nx">obj</span><span class="p">;</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">methodName</span> <span class="o">=</span> <span class="nx">sFn</span><span class="p">;</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">method</span> <span class="o">=</span> <span class="nx">obj</span><span class="p">[</span><span class="nx">sFn</span><span class="p">];</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">before</span> <span class="o">=</span> <span class="p">{};</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">after</span> <span class="o">=</span> <span class="p">{};</span>
<span class="p">};</span>

<span class="cm">/**</span>
<span class="cm"> * Register a aop subscriber</span>
<span class="cm"> * @method register</span>
<span class="cm"> * @param sid {string} the subscriber id</span>
<span class="cm"> * @param fn {Function} the function to execute</span>
<span class="cm"> * @param when {string} when to execute the function</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nx">Method</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">register</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">sid</span><span class="p">,</span> <span class="nx">fn</span><span class="p">,</span> <span class="nx">when</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="nx">when</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">this</span><span class="p">.</span><span class="nx">after</span><span class="p">[</span><span class="nx">sid</span><span class="p">]</span> <span class="o">=</span> <span class="nx">fn</span><span class="p">;</span>
    <span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
        <span class="k">this</span><span class="p">.</span><span class="nx">before</span><span class="p">[</span><span class="nx">sid</span><span class="p">]</span> <span class="o">=</span> <span class="nx">fn</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">};</span>

<span class="cm">/**</span>
<span class="cm"> * Unregister a aop subscriber</span>
<span class="cm"> * @method delete</span>
<span class="cm"> * @param sid {string} the subscriber id</span>
<span class="cm"> * @param fn {Function} the function to execute</span>
<span class="cm"> * @param when {string} when to execute the function</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nx">Method</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">_delete</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">sid</span><span class="p">)</span> <span class="p">{</span>
    <span class="c1">// Y.log(&#39;Y.Do._delete: &#39; + sid, &#39;info&#39;, &#39;Event&#39;);</span>
    <span class="k">delete</span> <span class="k">this</span><span class="p">.</span><span class="nx">before</span><span class="p">[</span><span class="nx">sid</span><span class="p">];</span>
    <span class="k">delete</span> <span class="k">this</span><span class="p">.</span><span class="nx">after</span><span class="p">[</span><span class="nx">sid</span><span class="p">];</span>
<span class="p">};</span>

<span class="cm">/**</span>
<span class="cm"> * Execute the wrapped method</span>
<span class="cm"> * @method exec</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nx">Method</span><span class="p">.</span><span class="nx">prototype</span><span class="p">.</span><span class="nx">exec</span> <span class="o">=</span> <span class="kd">function</span> <span class="p">()</span> <span class="p">{</span>

    <span class="kd">var</span> <span class="nx">args</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nb">Array</span><span class="p">(</span><span class="nx">arguments</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="kc">true</span><span class="p">),</span>
        <span class="nx">i</span><span class="p">,</span> <span class="nx">ret</span><span class="p">,</span> <span class="nx">newRet</span><span class="p">,</span>
        <span class="nx">bf</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">before</span><span class="p">,</span>
        <span class="nx">af</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">after</span><span class="p">,</span>
        <span class="nx">prevented</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>

    <span class="c1">// execute before</span>
    <span class="k">for</span> <span class="p">(</span><span class="nx">i</span> <span class="k">in</span> <span class="nx">bf</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">if</span> <span class="p">(</span><span class="nx">bf</span><span class="p">.</span><span class="nx">hasOwnProperty</span><span class="p">(</span><span class="nx">i</span><span class="p">))</span> <span class="p">{</span>
            <span class="nx">ret</span> <span class="o">=</span> <span class="nx">bf</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">apply</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">args</span><span class="p">);</span>
            <span class="k">if</span> <span class="p">(</span><span class="nx">ret</span><span class="p">)</span> <span class="p">{</span>
                <span class="k">switch</span> <span class="p">(</span><span class="nx">ret</span><span class="p">.</span><span class="nx">constructor</span><span class="p">)</span> <span class="p">{</span>
                    <span class="k">case</span> <span class="nx">DO</span><span class="p">.</span><span class="nx">Halt</span><span class="o">:</span>
                        <span class="k">return</span> <span class="nx">ret</span><span class="p">.</span><span class="nx">retVal</span><span class="p">;</span>
                    <span class="k">case</span> <span class="nx">DO</span><span class="p">.</span><span class="nx">AlterArgs</span><span class="o">:</span>
                        <span class="nx">args</span> <span class="o">=</span> <span class="nx">ret</span><span class="p">.</span><span class="nx">newArgs</span><span class="p">;</span>
                        <span class="k">break</span><span class="p">;</span>
                    <span class="k">case</span> <span class="nx">DO</span><span class="p">.</span><span class="nx">Prevent</span><span class="o">:</span>
                        <span class="nx">prevented</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
                        <span class="k">break</span><span class="p">;</span>
                    <span class="k">default</span><span class="o">:</span>
                <span class="p">}</span>
            <span class="p">}</span>
        <span class="p">}</span>
    <span class="p">}</span>

    <span class="c1">// execute method</span>
    <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">prevented</span><span class="p">)</span> <span class="p">{</span>
        <span class="nx">ret</span> <span class="o">=</span> <span class="k">this</span><span class="p">.</span><span class="nx">method</span><span class="p">.</span><span class="nx">apply</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">args</span><span class="p">);</span>
    <span class="p">}</span>

    <span class="nx">DO</span><span class="p">.</span><span class="nx">originalRetVal</span> <span class="o">=</span> <span class="nx">ret</span><span class="p">;</span>
    <span class="nx">DO</span><span class="p">.</span><span class="nx">currentRetVal</span> <span class="o">=</span> <span class="nx">ret</span><span class="p">;</span>

    <span class="c1">// execute after methods.</span>
    <span class="k">for</span> <span class="p">(</span><span class="nx">i</span> <span class="k">in</span> <span class="nx">af</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">if</span> <span class="p">(</span><span class="nx">af</span><span class="p">.</span><span class="nx">hasOwnProperty</span><span class="p">(</span><span class="nx">i</span><span class="p">))</span> <span class="p">{</span>
            <span class="nx">newRet</span> <span class="o">=</span> <span class="nx">af</span><span class="p">[</span><span class="nx">i</span><span class="p">].</span><span class="nx">apply</span><span class="p">(</span><span class="k">this</span><span class="p">.</span><span class="nx">obj</span><span class="p">,</span> <span class="nx">args</span><span class="p">);</span>
            <span class="c1">// Stop processing if a Halt object is returned</span>
            <span class="k">if</span> <span class="p">(</span><span class="nx">newRet</span> <span class="o">&amp;&amp;</span> <span class="nx">newRet</span><span class="p">.</span><span class="nx">constructor</span> <span class="o">==</span> <span class="nx">DO</span><span class="p">.</span><span class="nx">Halt</span><span class="p">)</span> <span class="p">{</span>
                <span class="k">return</span> <span class="nx">newRet</span><span class="p">.</span><span class="nx">retVal</span><span class="p">;</span>
            <span class="c1">// Check for a new return value</span>
            <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="nx">newRet</span> <span class="o">&amp;&amp;</span> <span class="nx">newRet</span><span class="p">.</span><span class="nx">constructor</span> <span class="o">==</span> <span class="nx">DO</span><span class="p">.</span><span class="nx">AlterReturn</span><span class="p">)</span> <span class="p">{</span>
                <span class="nx">ret</span> <span class="o">=</span> <span class="nx">newRet</span><span class="p">.</span><span class="nx">newRetVal</span><span class="p">;</span>
                <span class="c1">// Update the static retval state</span>
                <span class="nx">DO</span><span class="p">.</span><span class="nx">currentRetVal</span> <span class="o">=</span> <span class="nx">ret</span><span class="p">;</span>
            <span class="p">}</span>
        <span class="p">}</span>
    <span class="p">}</span>

    <span class="k">return</span> <span class="nx">ret</span><span class="p">;</span>
<span class="p">};</span>

<span class="c1">//////////////////////////////////////////////////////////////////////////</span>

<span class="cm">/**</span>
<span class="cm"> * Return an AlterArgs object when you want to change the arguments that</span>
<span class="cm"> * were passed into the function.  An example would be a service that scrubs</span>
<span class="cm"> * out illegal characters prior to executing the core business logic.</span>
<span class="cm"> * @class Do.AlterArgs</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nx">AlterArgs</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">msg</span><span class="p">,</span> <span class="nx">newArgs</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">msg</span> <span class="o">=</span> <span class="nx">msg</span><span class="p">;</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">newArgs</span> <span class="o">=</span> <span class="nx">newArgs</span><span class="p">;</span>
<span class="p">};</span>

<span class="cm">/**</span>
<span class="cm"> * Return an AlterReturn object when you want to change the result returned</span>
<span class="cm"> * from the core method to the caller</span>
<span class="cm"> * @class Do.AlterReturn</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nx">AlterReturn</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">msg</span><span class="p">,</span> <span class="nx">newRetVal</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">msg</span> <span class="o">=</span> <span class="nx">msg</span><span class="p">;</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">newRetVal</span> <span class="o">=</span> <span class="nx">newRetVal</span><span class="p">;</span>
<span class="p">};</span>

<span class="cm">/**</span>
<span class="cm"> * Return a Halt object when you want to terminate the execution</span>
<span class="cm"> * of all subsequent subscribers as well as the wrapped method</span>
<span class="cm"> * if it has not exectued yet.</span>
<span class="cm"> * @class Do.Halt</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nx">Halt</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">msg</span><span class="p">,</span> <span class="nx">retVal</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">msg</span> <span class="o">=</span> <span class="nx">msg</span><span class="p">;</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">retVal</span> <span class="o">=</span> <span class="nx">retVal</span><span class="p">;</span>
<span class="p">};</span>

<span class="cm">/**</span>
<span class="cm"> * Return a Prevent object when you want to prevent the wrapped function</span>
<span class="cm"> * from executing, but want the remaining listeners to execute</span>
<span class="cm"> * @class Do.Prevent</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nx">Prevent</span> <span class="o">=</span> <span class="kd">function</span><span class="p">(</span><span class="nx">msg</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">msg</span> <span class="o">=</span> <span class="nx">msg</span><span class="p">;</span>
<span class="p">};</span>

<span class="cm">/**</span>
<span class="cm"> * Return an Error object when you want to terminate the execution</span>
<span class="cm"> * of all subsequent method calls.</span>
<span class="cm"> * @class Do.Error</span>
<span class="cm"> * @deprecated use Y.Do.Halt or Y.Do.Prevent</span>
<span class="cm"> */</span>
<span class="nx">DO</span><span class="p">.</span><span class="nb">Error</span> <span class="o">=</span> <span class="nx">DO</span><span class="p">.</span><span class="nx">Halt</span><span class="p">;</span>


<span class="c1">//////////////////////////////////////////////////////////////////////////</span>

<span class="c1">// Y[&quot;Event&quot;] &amp;&amp; Y.Event.addListener(window, &quot;unload&quot;, Y.Do._unload, Y.Do);</span>
</pre></div>

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